Electric incandescent lamp.



No. 897,110. PATENTED AUG. 25, 1908.. H. KUZEL & R. HOKE. ELECTRIC INGANDESGENT LAMP.

APPLICATION FILED MAB. 5, 1907.

fwrmssses JNVENTOR'S V at A A'TTOKN EYS iiNiri-in sana ss PATENT orrron.

HANS KUZEL, or

. HUNGARY; SAID HOKE BADEN, NEAR "VIENNA, AND RICHARD HOKE, or VIENNA, AUSTRIA,

ASSIGNOR TO SAID KUZEL,

E ""IC'I'RIC INCANDESCENT'LAMP.

Specification of Letters Patent.

Patented Aug. 25, 1908.

Application filed March 1907. Serial No. 360,795.

To e65 whom it may concern:

Be it'known that we, HANS 'KUZEL, a sub ject of the Emperor of Germany, residing at Baden, near Hungary, and "RICHARD Home,

the Emperor ofAustria-Hungar a subject of residing'at Vienna, Empire of Austria-Hungary, have Qlii invented certain new and useful Improve merits in Electric Incandescence Lamps, of which the following is a full, clear, and exact description, such as will enable others skilled in the-art to which it appertains to make and use the same.

Our invention relates to electric incandescence' larnps having horseshoe shaped or 'U;shaped metallic filaments and has for its os'oconstruct such lamps as to prevent i'g'hboringflegs of such filaments to come into contact with each other while the lam is burning whereby the filament would be estroyed. As is well known such incandescence lamps are generally used in a hanging position so that the filaments which,

' when heated to incandescence become rather vices such as eyelets soft, hang downwards in a vertical position. Heretofore it was the general PIELCtICG'tO so arrange the pointsof connection between the filaments and the supply wires that in the hanging lamp they are in vertical lines above the centers of the usual holding dehooks or the like serving for supporting the gnietal filaments and preventing them from oming into contact with the glass bulb or with each other and from'becoming entangled with each other during transport or handling: Usually the said holding devices were so constructed and arranged as to hold only one leg of each horse shoe shaped filament. It has also been proposed for enabling metal filament incandescence lamps to be used in an oblique or upright position to fix the filaments directly at the yoke or bend by two hooks. The filament 'then' cannot be displaced and has not the sufficient play that would enable it to contract and expand freely; on the contrary with this arrangement the filament is to some extent under tension so that it is liable to break.

Now the extremely fine anddelicate metal filaments of hanging electric incandescence lamps of low candle power .even when held with direct current to such extent that it- Vienna, Empire of Austria'.

' the like.

that the distortions and deformations of the,

filaments and the liability of the lamp of be ing destroyed consequent thereon may be avoided or reduced to a minimum by so arranging the points of connection of the filaments to the supply wires and the holding devices of the filaments that the weightof the filaments counteracts the distorting or deforming effects of electricity- This result is obtained according to our invention by so arranging the points of attachment of the horseshoe shaped metal filaments to the sup ply wires (that is "to say the soldering or cementing beads) relatively to the holding devices (that is to sayeyelets, hooks or the like) that in a hanging lamp the former are not in vertical lines above the centers ofthe latter, as heretofore, but that as contradistinguished from the arrangement heretofore practicedthe radial distance between" the said points of attachment from the longitudinal axis of'lamp is different from the radial distance of the centers of the holding devices from such axis. For securing the desired result it is necessary that each leg of each filament is provided with a holding device of any known or preferred construction such as an eyelet, hook or the like. i In the accompanying drawings: Figure 1 is a perspective view of one form of execution of our improved lamp before use; Fig. 1 is a side elevation of a similar lamp before use the bulb being removed; Fig. 1 is a plan view of Fig. 1 Fig. 2 shows a side elevation and Fig. 2 a plan view of a modification of our improved lamp. In the drawings a are the filaments,.b the supply wires, 0 the solder or cement beads by which the ends of" the filaments are connected to the supply wires and (Z are the holding devices, one such holding device being provided for each leg of each filament.

e Figs. 1, 1 and 1 is a central support secured in the bulb f and carrying the holding devices d which maybe of any known or preferred construction, such as hooks eyelets or When the holding devices are made of some conductive material, such as a refractory metal, they must be carefully insulated from each other, for instance by be -15.of the filaments thus constitute before burnprojecting inwards.

from the central support .a which is preferably niad'e'of glass, andintegral with the nip-.

ples.

-In the construction shown"-in l[*i s.--1', ..1 v and l? the distance-between the beadsc or points of attachment or connection-between thefreeendsofthe filaments a and the su f die supply wires from-the longitudinal axis of the.

ply wires band the longitudinal axis o amp 1s greater than the distance between dthe ing the side edges of a pyramid frustum having'its smaller-base turned downwards; a

' In the modification shown'in Figs 2 and 2 the central supports is dispensed with and the holding devices are tubes or' ,rods h "secured to the-bulb f and The distance between the beads c and the longitudinal aiiis of the lamp is in'this case smaller than the distance vbetween the holding-deyicesd and the same axis so thatthe legs oflth'e filaments constitute before burning pra'ctically the side edges of a pyramid frustiim ha ing itslarger base turned downwards. In eithercase the legs of the filaments are inclined to the vertical axis of the hanging lamp and gravity counteracts the distorting or deforming eife'ctsof,

electricity.

'1. In an electric incandescent lam the combination of supply wires, a plura ity oi.

ed to a supply wire,

horse-shoe shaped metal filaments,each such filament having each of its free ends connectvic'es, means for supporting said holding de vices the bulb, the said holding devices beply wires and the b'ight of centers of the holding carried by small glass.

.' at points intermediate insulated holding dev sea -1o to engagebothlegsof each fila ment at. points..1nte'rmediate' between the points ofc'onnection' of such legs to the sup such filament, the legsof eachfilainent bein longitudinal axis -01? the bulb and the distance betweenthe points of connection between-the free end's'of the filaments and the lamp being different from the distance of the axis, substantially as anclfor the purpose-described.

2. In an. electric incandescent 'larn the inclined to the devices from the saidcombination of supply wires, a plura ityof 1 horse-shoe shaped metal filaments, each such filament having each of its free ends connected to asup ly \VlI6,"fi. c'entralsup ort within the bulb otthe la-In i11sulate(l, iiolding de- Vices attached to t e adapted to engageboth legs'of eac i'filanientj between the points of connection of such legs to the su ply wires and i the light of such filament, t" e legs: of

each filament. being inclined to the longitw 'dinal axis 'itudinal axis :of the lamp being different ilbln the d-istance'ot the centers of the hold} ing devices" from the said axis, .sub stantially as and'for thepurpose described.

' In testimony. w

two subscribing w'i.tnesses;

' "HANS KUZEnJJ RICHARD -HOKE. Witnesses: I

'ALvEsTo 'S. Hoeun, AUGUST Fueenn,

centiial' su port Sandand the distance, between th points of connection between the free ends of the filaments andsupply wires from the lon erect. we-haive signed our names to thlsspecification', 1n the presence of 

